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(3aR,4R,20R,20aR,23aS,24R,29R,29aS)-25,26,27,28-tetradehydro-3a,4,5,6,7,17,18,19,20,20a,23a,24,29,29a-tetradecahydro-2,2,22,22-tetramethyl-6,18-bis(phenylsulfonyl)-4,29:20,24-diepoxy-8,11:13,16-diethenobis<1,3>dioxolo<4,5-j:4',5'-r><1,7,22>oxadiazacy...